A Study of the Flame Structure near the Extinction Limit by means of Chemiluminescence Spectroscopy

为了探索湍流预混火焰中近消焰小火焰的行为，分别利用矩形喷嘴燃烧器和逆流燃烧器，在非应变和应变火焰中，寻求了不同应变率下，C2 (C2*(0,0)/C2*(1,0)) 515/470nm波段的发射强度比与火焰温度的关系。对于应变火焰，当应变速率增大且混合物等效比一定时，火焰温度降低，C2*(0,0)/C2*(1,0)略有降低

In order to explore behavior of the near extinction flamelet in turbulent premixed flames, relation between the emission intensity ratio of 515/470nm band of C2 (C2*(0,0)/C2*(1,0)) and the flame temperature for various strain rates has been sought in both unstrained and strained flames by using a rectangular nozzle burner and a counter-flow burner, respectively. For strained flames, as the strain rate increases with the equivalence ratio of the mixture is constant, the flame temperature decreases, and C2*(0,0)/C2*(1,0) decreases slightly